Marcos Siqueira Jr.

Joined PartnerHero in 2021 and the company was acquired by Crescendo in late 2024; retained through the transition along with the core team maintaining products essential to existing customers.

• Built an LLM-powered support ticket evaluation pipeline — refactored the underlying data pipeline, attached it to the product, and shipped it as an automated ticket-scoring feature that improved internal operational workflows and release reliability.
• Engineered GraphQL APIs and Firestore-backed pipelines serving the ticket-scoring feature and adjacent product surfaces.
• Led system architecture improvements and framework/runtime upgrades, standardizing backend services on TypeScript, NestJS, and modern Node.js to eliminate legacy technical debt.
• Built a NestJS REST API unifying internal workflows with third-party enterprise HRIS platforms, abstracting complex data models and enabling vendor migrations with zero operational downtime.
• Maintained deployment pipelines via GCP (Cloud Run), Docker, and GitHub Actions; translated ambiguous operational needs into clear API contracts with stakeholders.
• Mentored junior developers and guided architectural decisions across the team.

• Engineered and scaled a high-throughput B2B Node.js search API, driving horizontal scaling, load testing, and performance profiling with a 20-person team to handle ~1M requests/min during Black Friday peak traffic.
• Worked on legacy PHP services and frontend applications while contributing to microservices architecture to decouple systems, leveraging AWS, Docker, Kafka, CI/CD, and observability tools.
• Boosted operational reliability through continuous metrics analysis and production support, while mentoring junior developers on team best practices.

• Engineered new features and maintained cross-stack email operation systems, including AngularJS/Flask dashboards, REST APIs, and Spark pipelines, enhancing operational visibility and backend reliability.
• Collaborated in a 4-person team to track key product metrics, support daily operations, and maintain high system availability.